Ultrasound and the Physics of Hearing (Grade 10 NSC Matric Physical Sciences): Flashcards
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Sound intensity definition
Sound intensity definition
Energy transmitted through unit area per second
Unit for sound intensity
Unit for sound intensity
Decibel (dB)
Ultrasound definition
Ultrasound definition
Sound with frequency above 20 kHz
Upper limit of human hearing
Upper limit of human hearing
20 kHz (20,000 Hz)
Medical ultrasound imaging principle
Medical ultrasound imaging principle
Reflection & transmission of waves at tissue boundaries
Three sections of the ear
Three sections of the ear
Outer ear, middle ear, inner ear
Sound level where hearing damage begins
Sound level where hearing damage begins
80 dB
Threshold of pain (sound level)
Threshold of pain (sound level)
120 dB
10 dB increase means
10 dB increase means
10 times more intensity
Cochlea function
Cochlea function
Converts vibrations into electrical signals